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Actually any 20W50 motor oil that's rated SH or SJ will work fine as long as it's changed regularly, but Harley recommends using their own brand, Syn3. I recommend using Mobil One 15W50.

Drain the oil while the motor's still hot to catch any suspended particles before they settle and always replace the oil filter when changing oil.

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Q: What kind of oil for 1998 HD sportster?
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